import 'package:flutter/foundation.dart';

import '../payment/order_api.dart';
import 'session_store.dart';

enum AuthMode { login, register }

class AuthViewModel extends ChangeNotifier {
  final OrderApi orderApi;
  final SessionStore sessionStore;

  AuthMode _mode = AuthMode.login;
  bool _loading = false;
  String? _error;

  AuthMode get mode => _mode;
  bool get loading => _loading;
  String? get error => _error;

  AuthViewModel({required this.orderApi, required this.sessionStore});

  void switchMode() {
    _mode = _mode == AuthMode.login ? AuthMode.register : AuthMode.login;
    _error = null;
    notifyListeners();
  }

  /// 本地输入校验失败提示（不进网络请求）
  void showError(String message) {
    _error = message;
    notifyListeners();
  }

  /// 登录或注册；成功返回 true（调用方负责跳转主界面）
  Future<bool> submit({required String phone, required String password}) async {
    _loading = true;
    _error = null;
    notifyListeners();
    try {
      if (_mode == AuthMode.login) {
        final token = await orderApi.login(phone: phone, password: password);
        await sessionStore.save(phone, token);
      } else {
        await orderApi.register(phone: phone, password: password);
        final token = await orderApi.login(phone: phone, password: password);
        await sessionStore.save(phone, token);
      }
      return true;
    } on OrderApiException catch (e) {
      _error = e.message;
      return false;
    } finally {
      _loading = false;
      notifyListeners();
    }
  }
}